Metalloprotein — The structure of hemoglobin. The heme cofactor, containing iron, shown in green. Metalloprotein is a generic term for a protein that contains a metal ion cofactor.[1] Metalloproteins have many different functions in cells … Wikipedia

Transition metal dioxygen complex — Dioxygen complexes are coordination compounds that contain O2 as a ligand.[1] The study of these compounds is inspired by oxygen carrying proteins such as myoglobin, hemoglobin, hemerythrin, and hemocyanin.[2] Several transition metals form… … Wikipedia